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ses: add reliable slot attribute 

The name provided by firmware is in a vendor specific format, publish
the slot number to have a reliable mechanism for identifying slots
across firmware implementations.  If the enclosure does not provide a
slot number fallback to the component number which is guaranteed unique,
and usually mirrors the slot number.

Cleaned up the unused ses_component.desc in the process.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dan Williams 2014-12-30 14:46:17 -08:00 committed by Christoph Hellwig
parent 967f7bab0e
commit 921ce7f578
3 changed files with 32 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/misc/enclosure.c
View File

@ -145,8 +145,10 @@ enclosure_register(struct device *dev, const char *name, int components,
if (err)
goto err;
for (i = 0; i < components; i++)
for (i = 0; i < components; i++) {
edev->component[i].number = -1;
edev->component[i].slot = -1;
}
mutex_lock(&container_list_lock);
list_add_tail(&edev->node, &container_list);
@ -589,6 +591,20 @@ static ssize_t get_component_type(struct device *cdev,
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
}
static ssize_t get_component_slot(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int slot;
/* if the enclosure does not override then use 'number' as a stand-in */
if (ecomp->slot >= 0)
slot = ecomp->slot;
else
slot = ecomp->number;
return snprintf(buf, 40, "%d\n", slot);
}
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
set_component_fault);
@ -599,6 +615,7 @@ static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
set_component_locate);
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
static struct attribute *enclosure_component_attrs[] = {
&dev_attr_fault.attr,
@ -606,6 +623,7 @@ static struct attribute *enclosure_component_attrs[] = {
&dev_attr_active.attr,
&dev_attr_locate.attr,
&dev_attr_type.attr,
&dev_attr_slot.attr,
NULL
};
ATTRIBUTE_GROUPS(enclosure_component);

17
drivers/scsi/ses.c
View File

@ -47,7 +47,6 @@ struct ses_device {
struct ses_component {
u64 addr;
unsigned char *desc;
};
static int ses_probe(struct device *dev)
@ -307,19 +306,26 @@ static void ses_process_descriptor(struct enclosure_component *ecomp,
int invalid = desc[0] & 0x80;
enum scsi_protocol proto = desc[0] & 0x0f;
u64 addr = 0;
int slot = -1;
struct ses_component *scomp = ecomp->scratch;
unsigned char *d;
scomp->desc = desc;
if (invalid)
return;
switch (proto) {
case SCSI_PROTOCOL_FCP:
if (eip) {
d = desc + 4;
slot = d[3];
}
break;
case SCSI_PROTOCOL_SAS:
if (eip)
if (eip) {
d = desc + 4;
slot = d[3];
d = desc + 8;
else
} else
d = desc + 4;
/* only take the phy0 addr */
addr = (u64)d[12] << 56 |
@ -335,6 +341,7 @@ static void ses_process_descriptor(struct enclosure_component *ecomp,
/* FIXME: Need to add more protocols than just SAS */
break;
}
ecomp->slot = slot;
scomp->addr = addr;
}

1
include/linux/enclosure.h
View File

@ -92,6 +92,7 @@ struct enclosure_component {
int fault;
int active;
int locate;
int slot;
enum enclosure_status status;
};